单项选择题

No one doubts ______ he is the best leader in the company.

A. whether
B. if
C. what
D. that
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单项选择题
The movie star______with your sister, didn't he
A. was used to dance
B. used to dancing
C. used to dance
D. was used to dancing
单项选择题
Every means______since then.
A. has been trying
B. have been trying
C. have been tried
D. has been tried
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